[英]How to do custom repository using TypeORM (MongoDB) in NestJS?
我有个问题。 随着@EntityRepository
装饰器在 typeorm@^0.3.6 中被标记为已弃用,现在在typeorm@^0.3.6
中为实体创建自定义存储库的推荐或 TypeScript 友好方式是什么? 之前的自定义存储库如下所示:
// users.repository.ts
import { EntityRepository, Repository } from 'typeorm';
import { User } from './user.entity';
@EntityRepository(User)
export class UsersRepository extends Repository<User> {
async createUser(firstName: string, lastName: string): Promise<User> {
const user = this.create({
firstName,
lastName,
});
await this.save(user);
return user;
}
}
而且由于 NestJS 默认配置了 TypeScript 支持,因此我可以在这样的服务中调用usersRepository.createUser()
而不会出现问题:
// users.service.ts
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { User } from './user.entity';
import { UsersRepository } from './users.repository';
@Injectable()
export class UsersService {
constructor(
@InjectRepository(UsersRepository)
private readonly usersRepository: UsersRepository,
) {}
async createUser(firstName: string, lastName: string): Promise<User> {
return this.usersRepository.createUser(firstName, lastName);
}
}
这是模块导入自定义存储库的方式:
// users.module.ts
import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { UsersController } from './users.controller';
import { UsersRepository } from './users.repository';
import { UsersService } from './users.service';
@Module({
imports: [TypeOrmModule.forFeature([UsersRepository])],
controllers: [UsersController],
providers: [UsersService],
exports: [UsersService],
})
export class UsersModule {}
另外,我在这里提到 MongoDB 的原因是因为我尝试使用仍然支持typeorm@0.2
的@EntityRepository
,但是当我尝试在模块中导入它时收到错误,说明Repository not found
或其他内容。 请注意,如果我在 TypeORM 中选择postgresql
作为我的数据库并进行上述相同的更改,我就没有这个问题。 因此我去检查最新的只是发现它已经被弃用了,我也没有在 NestJS 文档中找到任何示例。
我想我找到了一个解决方案,它允许调用自定义方法,也可以调用继承的方法。 似乎这个“问题”还不太流行,但在 typeorm GitHub 线程中肯定有一些关于它的讨论: https ://github.com/typeorm/typeorm/issues/9013
以下解决方案使用 MySQL 作为底层数据库驱动程序,但我认为它也适用于 MongoDB。
team.repository.ts
import {DataSource, Repository} from 'typeorm';
import {Injectable} from '@nestjs/common';
import {Team} from '@Domain/Team/Models/team.entity';
@Injectable()
export class TeamRepository extends Repository<Team>
{
constructor(private dataSource: DataSource)
{
super(Team, dataSource.createEntityManager());
}
/**
* Add a basic where clause to the query and return the first result.
*/
async firstWhere(column: string, value: string | number, operator = '='): Promise<Team | undefined>
{
return await this.createQueryBuilder()
.where(`Team.${column} ${operator} :value`, {value: value})
.getOne();
}
}
团队服务.ts
import {Injectable} from '@nestjs/common';
import {Team} from '@Domain/Team/Models/team.entity';
import {TeamRepository} from '@Domain/Team/Repositories/team.repository';
@Injectable()
export class TeamService
{
constructor(
private teamRepository: TeamRepository,
)
{
}
async create(): Promise<Team>
{
const team: Team = await this.teamRepository.firstWhere('id', 1);
return this.teamRepository.save(team);
}
}
团队模块.ts
import {Module} from '@nestjs/common';
import {TeamService} from '@Domain/Team/Services/team.service';
import {TypeOrmModule} from '@nestjs/typeorm';
import {Team} from '@Domain/Team/Models/team.entity';
import {TeamRepository} from '@Domain/Team/Repositories/team.repository';
@Module({
imports: [TypeOrmModule.forFeature([Team])],
exports: [TeamService],
providers: [TeamService, TeamRepository],
})
export class TeamModule
{
}
您可以通过以下方式在TypeORM
中为 mongo 创建自定义存储库:
users.repository.ts
在这里,您将使用@Injectable
装饰器而不是使用@EntityRepository
,对于注入, schema
将使用 MongoRepository
// users.repository.ts
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { MongoRepository } from 'typeorm';
import { User } from './user.entity';
@Injectable()
export class UsersRepository {
constructor(
@InjectRepository(User)
private readonly usersRepository: MongoRepository<User>,
) {}
async createUser(firstName: string, lastName: string): Promise<User> {
const user = new User({
firstName,
lastName,
});
await this.usersRepository.save(user);
return user;
}
}
users.service.ts
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { User } from './user.entity';
import { UsersRepository } from './users.repository';
@Injectable()
export class UsersService {
constructor(private readonly usersRepository: UsersRepository) {}
async createUser(firstName: string, lastName: string): Promise<User> {
return this.usersRepository.createUser(firstName, lastName);
}
}
users.module.ts
import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { UsersController } from './users.controller';
import { UsersRepository } from './users.repository';
import { UsersService } from './users.service';
import { User } from './user.entity';
import { UsersRepository } from './database/repository/UsersRepository';
@Module({
imports: [TypeOrmModule.forFeature([User])],
controllers: [UsersController],
providers: [UsersRepository, UsersService],
exports: [UsersService],
})
export class UsersModule {}
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